WordNet sense 1 (combining or mixing):

blending, mingling

WordNet sense 2 (combined or mixed together so that the constituent parts are indistinguishable):

blended

WordNet sense 3 (flowing together):

confluent

WordNet sense 4 (tending to come together from different directions):

convergent

WordNet sense 5 (a flowing together):

confluence, conflux

WordNet sense 6 (the act of joining together as one):

meeting, coming together